Changes

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</ul></div><ul style="text-align: left">The Geographic Institute of Spain [http://www.ign.es/web/resources/sismologia/acelerografos/acelerografos.html monitors accelerometers] placed in urban areas in the most seismically active Spanish regions. The primary purpose of these seismic stations is to record the intense ground movements caused by earthquakes. However, due to their urban locations, they may also provide accurate recordings of the cultural or anthropic seismic noise levels caused by human activity, such as traffic, industry and other causes of ground vibrations. <br>

The accelerometer records show that the average daily cultural seismic noise level drops by several decibels at the weekend. They also confirm alterations in seismic noise due to the decrease, cessation and resumption of human activities during lockdown and subsequent downscaling phases. Thus, the daily average noise level decreased during lockdown by between 1 and 7 dB, depending on the gauging station, compared to the prior reference level. Subsequently, with the gradual resumption of activity during the transition to ‘new normal life’, the cultural seismic noise progressively increased until it reached figures similar to those registered before lockdown, as shown by the daily average anthropic seismic noise levels recorded by the accelerometers in Granada and Lorca (Region of Murcia/Región de Murcia).</ul>}}</div>